Adsorption of Lead with Silica Gel Modified with Polyamidoamine Dendrimer and Thiomalic Acid

Department of Chemistry and Biological Engineering, Guilin University of Technology, Guilin 541004, China

^a 2004046@glut.edu.cn
^b 935614725@qq.com
^c 380664562@qq.com
^d lili19880412@qq.com
^e 1823805134@qq.com
^* Corresponding author: 2004046@glut.edu.cn

Abstract

New adsorbents PAMAM-n.0TMSG (n=1,2,3,4) with thiomalic acid as functional group has been prepared based on polyamidoamine dendrimer modified silica gel and characterized with FTIR, SEM and TG. Microcolumn enrichment and measurement of Pb²⁺ with graphite furnace atomic absorption spectroscopy (GFAAS) was investigated with PAMAM-n.0TMSG (n=1,2,3,4) as adsorbent. The adsorption conditions were optimized. The increase of grafted generation of PAMAM-n.0TMSG could effectively improved the adsorption performance of adsorbents. The adsorption capacity of adsorbents was 14.42, 16.19, 20.79 and 25.32 mg g^-1 respectively, With PAMAM-4.0TMSG as adsorbent, microcolumn enrichment and measurement of Pb²⁺ with GFAAS was proposed. The relative standard deviation (R.S.D.) was 1.4% (n=11) for 0.2 μg mL^-1 of Pb²⁺. The limit of detection (LOD) of 2.9ng mL⁻¹ was achieved. The proposed column enrichment method was applied for detection of Pb²⁺ in tap water and sea water samples successfully.